发明名称 |
WIRELESS TRANSMISSION USING FIBER LINK |
摘要 |
A wireless transmission and reception system includes a mixing section using a phase shift keying or quadrature amplitude modulation scheme to modulate a baseband signal, representing voice or data, onto a carrier frequency within the range of standard (cable television format) AM-VSB frequencies. A combiner section combines the modulated carrier signal into a channel of a multiplexed cable television (CATV) signal having two or more channels. The CATV signal is used to modulate a laser source. The laser source generates a laser signal based on the CATV signal. The laser signal is optically coupled into a bidirectional fiber link. The fiber link transmits the laser signal and ultimately converts the laser signal into the electrical CATV signal. A splitting section coupled to the bidirectional fiber link splits the modulated carrier signal from the CATV signal. A demodulating section coupled to the splitting section recovers the baseband signal from the modulated carrier signal. The baseband signal is remodulated onto a carrier signal having a designated wireless frequency and is broadcast into free space using an antenna. Signals received by the antenna from free space are amplified and passed through the bidirectional fiber link. |
申请公布号 |
WO9745971(A1) |
申请公布日期 |
1997.12.04 |
申请号 |
WO1997US07197 |
申请日期 |
1997.05.01 |
申请人 |
AT & T CORP. |
发明人 |
DUTTA, NILOY, KUMAR;FREEMAN, PAUL, NATHAN |
分类号 |
H04B10/12;H04J14/02;H04N7/22 |
主分类号 |
H04B10/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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